I have tried it once just for HAHAs but I am concerned over curb rash on the wheels. I don't think the system is designed to take that possibility into account. So although it does the job well rubbing a wheel up against a curb is far more of a concern to me then finding another place to park.

Park assist does rub rims against the curb. Lucky that I stop it before curb rubs the alloy. I never use it again. I always turn on top view cam and park it myself since. It is great for SUV. I use Mercedes ML park assist feature frequently when I had it, and curb rubs only the tires so far. Also, Mercedes Park Assist is always on at speed lower than 15 MPH, so it is simpler to use.